New LLC

Hi there!  I retired from my corporate job last year and created an LLC inFebruary try to sell my handmade items/art on Etsy, Makerplace, etc.  I have spent about 2k in startup costs (setting up LLC, materials, listing fees, etc.) to date, started my shops in May/June....but have so far only had 3 sales totalling less than $150.  I just found out that LLC should be filing quarterly estimated taxes.  I was hoping to just make a few hundred dollars a month for extra retirement play money.  Should I submit for September?  How do I estimate?